I originally posted this in a different forum, but this might be the better place (1st time poster!)

My 13 year old daughter came home from the weekend at her dads and told me that her 16 year old stepsister had told my daughter that it was okay to smoke pot if you only did it sometimes and that it wasn't addictive if you didn't do it all the time. My daughter also said that stepsister had stated that my daughter would definitely do drugs. I am concerned that the stepsister may be experimenting with drugs and may possibly entice my daughter into trying them. They are frequently left on their own.

Is there anything I can do besides telling the ex of the conversation and hoping he and the girls mother take action (which is doubtful except to deny that there might be an issue)

I've reinforced with my daughter that doing drugs at all is wrong.

Any advice is appreciated!